5627 1ST AVE SE 2016-01-01 MF Import

ARC STANDARD ROCK�RY CONSTRUCTION GUIDELINES lo overlay thc sced and mulch with either pcgged in-place jute matting, or some other focm of approved geotextile,to help maintain the secd in-place until thc root mat has an oppo�tunity to gertninate and take hold. 3.01.7 Monitorine: All rockeries coasuucted against cuts or fills in excess of eight feet in height shall be • periodically monitored during constiuction by the geotechnical engineer to verify that the natuie and quality of the materials being used are appropriate, that the constmction proceduies are appropriate, and that the rockery is beir�g conswcted in a generally professional manner and in accordance with this pRC standazd and any supplemental recommenclations. , On completion of the rockery;the geoterhnical engineer should submit to the client, the rockery contractor, and to the appropriate municipality, copies of his rockery examination icpons along with a final repoR surtunarizing rockery constcucaon. 3.01.8 Fill Comoaction: Where rockeries are cauoeucted in front of a fill, it is impeiative that the owner ensuro the fill be placed and compacted in a manner that will provide a competent fill mass. To achieve this goal, all fills should consist of ieladvely clean, organic and debris 8ee g�anulaz marerials with a maxunum siu of four inches. Ideally, but particularly if placement and compacdon is to take place during the wa season, they should contain no moce than �even percent fines (silt and clay sized particles) passing the number 200 mesh sieve. All fills should be placed in thin liAs not exceeding ten inches in loose thiclmess. Each lift should be compacted to at least 95 percent of the maximum dry density,u determined by ASTM Test Method D-1557- 78 (Madified Proctor), before any additional fill is placed and compacted. In-place density tests should be perfocmed at random locadons within.each lift of the fill to verify that this degree of compacaon is being achieved. 3.01.9 Fill Construction and Reinforcement: There are two methods of constructing a fill. The fus4 which typically applies to rockeries of less than eight feet in height,is to ovecbuild and then cut back the fill. The second, which applies to all rockeries in excess of eight fcet in height, is to conswct the fill using a geogrid or geotextile rcinfo�ement Overbuilding the fill allows for satisfactory compaction of the fill mass out beyond the locadon of the,fill. face to be protected. Overbuilding also allows the earthwork contractor to use larger and more effecdve compaction eyuipment in his compactive efforts, thereby typically aciueving a more competent fill mass. Cutting back into the well compacted fill also typically icsults in constmcdon of a competent neaz vertical fill face against which to build the rockery. For tlie higher rockerics the use oC a geogrid ar geotextile fabric to help reinforce the fill results in t2fp5/9t Page 5